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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 剩余参数， 只能放在最后，后面不能再写参数了
        // Rest parameter must be last formal parameter
        function add (val, ...arg) {
            console.log(val);
            console.log(arg);
        }
        add(1)
        add(1, 2, 3)
        add(1, 'a', true, 8)
    </script>
</body>
</html>